The linear dielectric response of TMDs consists of two distinct regimes:
the interband regime, where electrons from the valence band are excited
to the conduction band, leaving being a hole [1]}, [2]}.
The attractive electrostatic interaction between this newly–formed
electron–hole pair leads to the formation of a bound state (exciton),
and its \(ns\)  states are optically active and can be observed in absorption
measurements [3]}. The second regime, characterized
by intra-exciton transitions, consists on the transition between the
excitonic ground state (\(1s\) ) and the empty \(np\)  states [4]}, [5]}.
Each of the \(1s\rightarrow np\)  transitions [6]}, [7]}, [8]}
is characterized by a peak in the dynamical polarizability which,
in turn, determines the dielectric response of the system in a pump–probe
experiment [9]}, [10]}.
